Posted by seb on Monday, January 3, 2011 at 5:23pm.
Three charges are arranged in a line. From left to right, the charges are:
Q1= 8mC, Q2 = +3mC and Q3 = 4mC. The distance between Q1 and Q2 is 0.3 m, and the distance between Q2 and Q3 is 0.2 m. Calculate the net electrostatic force on Q3.
how can you find what point Q2 will be at equilibrium. show work

physics  bobpursley, Monday, January 3, 2011 at 5:44pm
the point where Q2 will be at equilibrium?
The forces on each side are equal and opposite.
Now Q1 is neg, Q2 is positive, so the force on Q2 will be to the left. But Q2 is +, and Q3 is negative, so the force on Q2 will be to the right.
so the idea is to set the two forces MAGNITUDEs equal (you know the directions are opposite already).
KQ1Q2/x^2=KQ2Q3/(.5x)^2
where you are putting all + charges (you need magnitudes). x is the distance from q1, and .5x is the distance from Q3.
solve for x

physics  seb, Monday, January 3, 2011 at 5:56pm
i know how to get to that point. but how would you solve for x. i know you can use the quadratic equation. but im not sure how to
Answer This Question
Related Questions
 physics  Three charges are arranged in a line. From left to right, the charges ...
 physics  1) A parallel plate capacitor has a potential difference between its ...
 Physics  A positive charge +q1 is located to the left of a negative charge q2...
 Physics  Find the work that should be done to increase the distance between two...
 Physics  The drawing shows four point charges. The value of q is 2.4 µC, and ...
 Physics  A positive charge +q is located to the left of a negative charge q. ...
 Physics  The drawings show three charges that have the same magnitude but ...
 Physics  Consider three charges arranged as shown. The picture is three ...
 physics  Suppose the charge q2 can be moved left or right along a line ...
 Physics  Charges of −q and +2q are fixed in place, with a distance of 4....
More Related Questions